Digital communication method and system

Abstract

This invention is concerned with a transmission control method and apparatus in a collision interval for a collision of multidimensional hopping patterns. In the present invention, each orthogonal wireless resource in the coordinate of the multidimensional orthogonal resource can hop according to the hopping pattern negotiated between a transmitter and a receiver, and each corresponding channel is distinguished by the hopping pattern. A specific multidimensional hopping pattern is allocated to each secondary station. The hopping pattern is either permanently allocated to the secondary stations or temporarily allocated from the primary station during a call set-up. The permanent allocation of the hopping pattern to the secondary stations is achieved when the hopping pattern is identified based on a unique identifier, such as ESN of the secondary station. The hopping patterns of the secondary stations are mutually independent so that the coordinates of the same orthogonal resource is allocated to different secondary stations in a simultaneous manner in a specific moment. Through this invention, in order to improve the performance of the multidimensional resource hopping multiplexing system, refining transmission and perforation mechanisms for the collisions of multidimensional resource hopping patterns can reduce the overall perforation probability.

1. A digital communication method, which is to perform a statistical multiplexing by allocating communication channels from a primary station to a plurality of secondary stations in synchronization based on a multidimensional orthogonal resource hopping method, the digital communication method comprising:
 (a) determining, by the primary station, whether or not signs of transmit data symbols are matched, when a collision between hopping patterns of multidimensional orthogonal resources occurs, the transmit data symbols being data symbols for all channels involved in the collision; 
 (b) transmitting all the data symbols, when the signs of the transmit data symbols are matched; and 
 (c) determining, by the primary station, data symbols to be transmitted according to the amplitudes of the transmit data symbols when the signs of the transmit data symbols are not matched, and perforating the transmit data symbols except the determined data symbols. 
 
   
   
     2. The digital communication method as claimed in  claim 1 , wherein the hopping patterns of the multidimensional orthogonal resources are mutually independent by the respective secondary stations. 
   
   
     3. The digital communication method as claimed in  claim 1 , wherein the multidimensional orthogonal resources have coordinates represented by “orthogonal resource # 1 , orthogonal resource # 2 , . . . , orthogonal resource #N”. 
   
   
     4. The digital communication method as claimed in  claim 3 , wherein the multidimensional orthogonal resources include frequency, time and orthogonal code that secure orthogonality. 
   
   
     5. The digital communication method as claimed in  claim 4 , wherein the multidimensional orthogonal resources with a collision of hopping patterns are limited in the total transmit signal amplitude from the primary station. 
   
   
     6. The digital communication method as claimed in  claim 1 , wherein the step (b) classifies the channels into a set S 0  of channels allocated but not transmitted in the units of the orthogonal wireless resource, a set S +  of channels having a positive data symbol transmitted in the units of the orthogonal wireless resource, and a set S −  of channels having a negative data symbol transmitted in the units of the orthogonal wireless resource, and determines data symbols to be transmitted in the units of the orthogonal wireless resource. 
   
   
     7. The digital communication method as claimed in  claim 6 , wherein the step (b) comprises:
 comparing the transmit signal amplitudes of two channels having a minimum transmit signal amplitude in each set, when neither the set S +  nor the set S −  is an empty set; and 
 determining data symbols to be transmitted in the units of the orthogonal wireless resource using the channel of the larger transmit signal amplitude as a reference value. 
 
   
   
     8. The digital communication method as claimed in  claim 7 , further comprising:
 controlling a transmission power of all channels in the set including the channel determined as the reference value to zero. 
 
   
   
     9. The digital communication method as claimed in  claim 7 , further comprising:
 sending the transmit signal value of a channel having the largest transmit signal amplitude and a size of less than or equal to a multiple of the reference value in the units of the orthogonal wireless resource, among the transmit signal amplitudes of channels in the set not including the channel determined as the reference value. 
 
   
   
     10. The digital communication method as claimed in  claim 7 , further comprising:
 sending a transmit signal value having the sign of the channel, included in the set not including the channel determined as the reference value, and an amplitude being a multiple of the reference value in the units of the orthogonal wireless resource. 
 
   
   
     11. The digital communication method as claimed in  claim 7 , further comprising:
 sending the sum of channels included in the set not including the channel determined as the reference value in the units of the orthogonal wireless resource. 
 
   
   
     12. The digital communication method as claimed in  claim 11 , further comprising:
 comparing the sum of channels included in the set not including the channel determined as the reference value with a multiple of the reference value, and sending a value having the smaller amplitude in the units of the orthogonal wireless resource. 
 
   
   
     13. A digital communication method, which is to perform a statistical multiplexing by allocating communication channels from a primary station to a plurality of secondary stations in synchronization based on a multidimensional orthogonal resource hopping method, the digital communication method comprising:
 (a) determining, by the primary station, the instantaneous collision rate in a specific frame of a multidimensional hopping pattern; and 
 (b) stopping, by the primary station, frame transmission in the order of starting from a least influenced channel, when the instantaneous collision rate exceeds a reference collision rate. 
 
   
   
     14. The digital communication method as claimed in  claim 13 , wherein the step (b) comprises:
 intentionally stopping frame transmission in the order of starting from a channel with the lowest quality requirement to a channel with the highest quality requirement. 
 
   
   
     15. The digital communication method as claimed in  claim 13 , wherein the step (b) comprises:
 intentionally stopping frame transmission in the order of starting from channels operated by automatic repeat request to channels not operated by automatic repeat request. 
 
   
   
     16. The digital communication method as claimed in  claim 15 , wherein for channels operated by automatic repeat request, the frame transmission is intentionally stopped in the order of starting from a channel with the smallest number of retransmissions to a channel with the largest number of transmissions frequency. 
   
   
     17. The digital communication method as claimed in  claim 13 , wherein the step (b) comprises:
 intentionally stopping frame transmission for the channel having higher transmission power in preference to the channel having lower transmission power. 
 
   
   
     18. The digital communication method as claimed in  claim 13 , wherein the step (b) comprises:
 intentionally stopping frame transmission in the order of starting from the channel having the smallest number of consecutive transmitted frames to the channel having the largest number of consecutive transmitted frames. 
 
   
   
     19. The digital communication method as claimed in  claim 13 , wherein the step (b) comprises:
 intentionally stopping frame transmission in the order of starting from channels being in soft handoff to channels not being in soft handoff. 
 
   
   
     20. A digital communication system, which is to perform a statistical multiplexing by allocating communication channels from a primary station to a plurality of secondary stations in synchronization based on a multidimensional orthogonal resource hopping method, the digital communication system comprising:
 means for generating a multidimensional hopping pattern; 
 means for selecting a corresponding orthogonal resource in a set of orthogonal resources and modulating data symbols according to the output of the multidimensional hopping pattern generating means; 
 collision detecting and control means for monitoring whether or not a collision of the multidimensional hopping patterns occurs, and comparing transmit data symbols to the secondary stations in an interval of the collision to determine whether or not signs of the transmit data symbols are matched; and 
 transmission power control means for compensating for a transmission-stopped part caused by a collision of the multidimensional hopping patterns and the unmatched transmit data symbols, and a loss of average received energy, 
 wherein the collision detecting and control means transmits all the data symbols when the signs of the transmit data symbols are matched, and 
 wherein the collision detecting and control means determines data symbols to be transmitted according to the amplitudes of the transmit data symbols when the signs of the transmit data symbols are not matched and perforates the transmit data symbols except the determined data symbols. 
 
   
   
     21. The digital communication system as claimed in  claim 20 , wherein the multidimensional orthogonal resource hopping patterns are mutually independent by the respective secondary stations. 
   
   
     22. The digital communication system as claimed in  claim 20 , wherein the primary station determines the number of allocated channels according to channel activity. 
   
   
     23. The digital communication system as claimed in  claim 20 , wherein the orthogonal wireless resource unit includes frequency, time and orthogonal code that secure orthogonality. 
   
   
     24. The digital communication system as claimed in  claim 20 , wherein the orthogonal wireless resource unit with a collision of hopping patterns is limited in total transmit signal amplitude from the primary station. 
   
   
     25. The digital communication system as claimed in  claim 20 , wherein the collision detection and control means controls transmit signals of each orthogonal wireless resource unit according to transmit data symbols of a channel involved in the hopping pattern collision of the multidimensional orthogonal resources and transmit signal amplitudes of the channel,
 the collision detection and control means determining the signs of data symbols transmitted in the units of the orthogonal wireless resource of the channel having hopping pattern collisions, 
 the collision detection and control means classifying the channels into a set S 0  of channels allocated but not transmitted in the units of the orthogonal wireless resource, a set S +  of channels having a positive data symbol transmitted in the units of the orthogonal wireless resource, and a set S −  of channels having a negative data symbol transmitted in the units of the orthogonal wireless resource, and determining data symbols to be transmitted in the units of the orthogonal wireless resource. 
 
   
   
     26. The digital communication system as claimed in  claim 25 , wherein the collision detection and control means compares the transmit signal amplitudes of two channels having a minimum transmit signal amplitude in each set, when neither the set S +  nor the set S −  is an empty set,
 the collision detection and control means determining data symbols to be transmitted in the units of the orthogonal wireless resource using the channel with the larger transmit signal amplitude as a reference value. 
 
   
   
     27. The digital communication system as claimed in  claim 26 , wherein the power control means controls the transmission power of all channels in the set including the channel determined as the reference value to zero. 
   
   
     28. The digital communication system as claimed in  claim 26 , wherein the collision detection and control means sends the transmit signal value of a channel having the largest transmit signal amplitude and a size of less than or equal to a multiple of the reference value in the units of the orthogonal wireless resource, among the transmit signal amplitudes of channels in the set not including the channel determined as the reference value. 
   
   
     29. The digital communication system as claimed in  claim 26 , wherein the collision detection control means sends a transmit signal value having the sign of the channel, included in the set not including the channel determined as the reference value, and an amplitude being a multiple of the reference value in the units of the orthogonal wireless resource. 
   
   
     30. The digital communication system as claimed in  claim 26 , wherein the collision detection and control means sends the sum of channels included in the set not including the channel determined as the reference value in the units of the orthogonal wireless resource. 
   
   
     31. The digital communication system as claimed in  claim 30 , wherein the collision detection and control means compares the sum of channels included in the set not including the channel determined as the reference value with a multiple of the reference value, and sends a value having a smaller amplitude in the units of the orthogonal wireless resource.